Top 100 Contractors in PSC M1: Operate Government Owned Buildings, FY2021

Name: Top 100 Contractors in PSC M1: Operate Government Owned Buildings, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 72% of FY2021 PSC M1 contract dollars

Contract obligations: $32,169,995,201 Net of deobligations, by contracts coded PSC M1 or a code under it
Contractors: 1,037 Parent companies with an obligation
Largest contractor: Honeywell International Inc. $5.98 billion, 17.8% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Honeywell International Inc. 3 awardees, including National Technology & Engineering Solutions of Sandia, LLC and Honeywell Federal Manufacturing & Technologies, LLC Top agencies DOE (Department of Energy) DOI (Department of the Interior) USAF (Department of the Air Force)	$5,982,114,347	17.8%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; up 3 since FY2020.
2	Triad National Security, LLC Top agencies DOE (Department of Energy)	$3,955,926,494	11.8%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; down 1 since FY2020.
3	Battelle Memorial Institute 3 awardees, including Battelle Energy Alliance, LLC Top agencies DOE (Department of Energy) DOT (Department of Transportation)	$2,633,653,694	7.8%	Rank history: #4 in FY2022, #9 in FY2023, #5 in FY2024 and #4 in FY2025; up 3 since FY2020.
4	Consolidated Nuclear Security, LLC Top agencies DOE (Department of Energy)	$2,607,717,690	7.8%	Rank history: #3 in FY2022, #3 in FY2023, #4 in FY2024 and #6 in FY2025; down 1 since FY2020.
5	Ut-Battelle LLC Top agencies DOE (Department of Energy)	$2,266,992,542	6.7%	Rank history: #5 in FY2022, #4 in FY2023, #6 in FY2024 and #5 in FY2025; unchanged since FY2020.
6	Savannah River Nuclear Solutions LLC Top agencies DOE (Department of Energy)	$1,663,520,279	4.9%	Rank history: #6 in FY2022, #5 in FY2023, #23 in FY2024 and not on the FY2025 list; up 1 since FY2020.
7	Fluor Corporation 2 awardees, including Fluor Marine Propulsion, LLC and Fluor Federal Solutions, LLC Top agencies DOE (Department of Energy) DOL (Department of Labor)	$1,616,363,974	4.8%	Rank history: #8 in FY2022, #7 in FY2023, #3 in FY2024 and #3 in FY2025; up 67 since FY2020.
8	Government of the United States 4 awardees, including Uchicago Argonne, LLC, Fermi Research Alliance, LLC and Army & Air Force Exchange Service Top agencies DOE (Department of Energy) Army (Department of the Army)	$1,608,470,969	4.8%	Rank history: #7 in FY2022, #8 in FY2023, #19 in FY2024 and not on the FY2025 list; up 1 since FY2020.
9	State of California Controllers Office 5 awardees, including The Regents of the University of California, University of California San Diego and State of California Water Resources Control Board Top agencies DOE (Department of Energy) Commerce (Department of Commerce) DOJ (Department of Justice)	$1,159,902,043	3.5%	Rank history: #9 in FY2022, #11 in FY2023, #24 in FY2024 and not on the FY2025 list; up 1 since FY2020.
10	Mission Support & Test Services LLC Top agencies DOE (Department of Energy)	$854,697,036	2.5%	Rank history: #11 in FY2022, #13 in FY2023, #9 in FY2024 and #12 in FY2025; up 5 since FY2020.
11	Brookhaven Science Associates LLC Top agencies DOE (Department of Energy)	$667,585,945	2.0%	Rank history: #10 in FY2022, #14 in FY2023, #12 in FY2024 and #14 in FY2025; up 2 since FY2020.
12	Leidos Holdings, Inc. 4 awardees, including Leidos Biomedical Research Inc. and Leidos, Inc. Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation) Army (Department of the Army)	$620,951,498	1.8%	Rank history: #13 in FY2022, #15 in FY2023, #17 in FY2024 and #19 in FY2025; up 2 since FY2020.
13	Alliance for Energy Innovation, LLC Top agencies DOE (Department of Energy) USAID (US Agency for International Development) Navy (Department of the Navy)	$587,241,583	1.7%	Rank history: #12 in FY2022, #12 in FY2023, #8 in FY2024 and #13 in FY2025; up 5 since FY2020.
14	The Leland Stanford Junior University Top agencies DOE (Department of Energy) DARPA (Defense Advanced Research Projects Agency) Commerce (Department of Commerce)	$516,370,442	1.5%	Rank history: #14 in FY2022, #16 in FY2023, #14 in FY2024 and #16 in FY2025; up 2 since FY2020.
15	Deployed Resources LLC Top agencies DHS (Department of Homeland Security)	$316,911,253	0.9%	Rank history: #15 in FY2022, #17 in FY2023, #15 in FY2024 and #58 in FY2025; new, not ranked in FY2020.
16	Management & Training Corporation Top agencies DOL (Department of Labor)	$212,991,572	0.6%	Rank history: #24 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
17	Sodexo Through Sodexo Management Inc. Top agencies Navy (Department of the Navy)	$188,332,459	0.6%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
18	Syncom Space Services LLC Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) HUD (Department of Housing and Urban Development)	$182,459,854	0.5%	Rank history: #18 in FY2022, #26 in FY2023, #43 in FY2024 and not on the FY2025 list; up 2 since FY2020.
19	Crowley Government Services Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$161,449,448	0.5%	Rank history: #47 in FY2022, #47 in FY2023, #39 in FY2024 and #56 in FY2025; up 22 since FY2020.
20	Jefferson Science Associates, LLC Top agencies DOE (Department of Energy)	$148,900,365	0.4%	Rank history: #17 in FY2022, #19 in FY2023, #22 in FY2024 and #22 in FY2025; up 1 since FY2020.
21	Computer Sciences Corporation Through PAE Applied Technologies LLC Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$142,969,397	0.4%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
22	The Trustees of Princeton University Top agencies DOE (Department of Energy)	$142,158,682	0.4%	Rank history: #19 in FY2022, #24 in FY2023, #27 in FY2024 and #21 in FY2025; up 2 since FY2020.
23	Mid-America Conversion Services, LLC Top agencies DOE (Department of Energy)	$127,944,659	0.4%	Rank history: #25 in FY2022, #28 in FY2023, #28 in FY2024 and #31 in FY2025; up 4 since FY2020.
24	Bowhead Logistics Management, LLC Top agencies Army (Department of the Army)	$95,072,603	0.3%	Rank history: #67 in FY2022, #50 in FY2023, #78 in FY2024 and #79 in FY2025; up 86 since FY2020.
25	Leidos Biomedical Research Inc. Top agencies HHS (Department of Health and Human Services)	$93,798,026	0.3%	Rank history: not on the FY2022–FY2025 lists; up 169 since FY2020.
26	Goodwill Industries of Southeastern Wisconsin, Inc. Top agencies Navy (Department of the Navy)	$93,181,932	0.3%	Rank history: #28 in FY2022, #27 in FY2023, #61 in FY2024 and #24 in FY2025; up 5 since FY2020.
27	Vectrus Systems Corporation 2 awardees, including V2X Systems LLC and Vectrus Services A / S Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$93,027,886	0.3%	Rank history: #71 in FY2022, #49 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
28	Saltchuk Resources, Inc. Through Tote Services, LLC Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency) Army (Department of the Army)	$84,775,822	0.3%	Rank history: #37 in FY2022, #32 in FY2023, #86 in FY2024 and not on the FY2025 list; down 2 since FY2020.
29	Pride Industries Top agencies Army (Department of the Army) DMA (Defense Media Activity)	$78,919,609	0.2%	Rank history: #32 in FY2022, #33 in FY2023, #36 in FY2024 and not on the FY2025 list; up 8 since FY2020.
30	Remington Arms Company LLC Through Dyncorp International LLC Top agencies USAF (Department of the Air Force)	$71,422,697	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
31	Chas Kurz & Co Inc 2 awardees, including Keystone Shipping Services, Inc. and Keystone Shipping Co Top agencies Navy (Department of the Navy) DOT (Department of Transportation) OSD (Office of the Secretary of Defense)	$71,069,098	0.2%	Rank history: #27 in FY2022, #22 in FY2023, #58 in FY2024 and not on the FY2025 list; up 14 since FY2020.
32	Adams and Associates Inc. Top agencies DOL (Department of Labor)	$70,063,553	0.2%	Rank history: #35 in FY2022, #63 in FY2023, not on the FY2024 list and #77 in FY2025; down 7 since FY2020.
33	Ldrm LLC Top agencies DOS (Department of State)	$69,893,368	0.2%	Rank history: #33 in FY2022, #31 in FY2023, #37 in FY2024 and #32 in FY2025; up 23 since FY2020.
34	Indyne, Inc. Top agencies USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$67,966,191	0.2%	Rank history: #30 in FY2022, #36 in FY2023, #34 in FY2024 and #33 in FY2025; up 14 since FY2020.
35	BAE Systems PLC 2 awardees, including BAE Systems Ordnance Systems Inc. Top agencies Army (Department of the Army)	$67,569,699	0.2%	Rank history: #66 in FY2022, #20 in FY2023, #25 in FY2024 and #41 in FY2025; down 7 since FY2020.
36	Tlingit Haida Tribal Business Corporation 3 awardees, including T&H Services, LLC, Kira Training Services LLC and Kira LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$66,352,210	0.2%	Rank history: #36 in FY2022, #38 in FY2023, #50 in FY2024 and not on the FY2025 list; up 15 since FY2020.
37	OWL Companies Through Career Systems Development Corporation Top agencies DOL (Department of Labor)	$66,166,622	0.2%	Rank history: #62 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
38	Patriot Contract Services, LLC Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense) Army (Department of the Army)	$65,894,606	0.2%	Rank history: #63 in FY2022, #48 in FY2023, #26 in FY2024 and #25 in FY2025; up 25 since FY2020.
39	Robinson Aviation (Rva), Inc. Top agencies DOT (Department of Transportation)	$65,742,590	0.2%	Rank history: #39 in FY2022, #35 in FY2023, #35 in FY2024 and #35 in FY2025; down 1 since FY2020.
40	Odle Management Group, L.L.C. Top agencies DOL (Department of Labor)	$65,617,980	0.2%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
41	Iowa State University of Science and Technology Top agencies DOE (Department of Energy)	$60,879,866	0.2%	Rank history: #38 in FY2022, #30 in FY2023, #48 in FY2024 and #29 in FY2025; up 5 since FY2020.
42	Jacobs Engineering Group Inc. 3 awardees, including Amentum Technology, Inc. Top agencies NASA (National Aeronautics and Space Administration) MDA (DOD Missile Defense Agency) USAF (Department of the Air Force)	$57,238,988	0.2%	Rank history: #42 in FY2022, #64 in FY2023, #94 in FY2024 and not on the FY2025 list; down 2 since FY2020.
43	Amentum Services, Inc. 2 awardees, including Dyncorp International LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$56,369,206	0.2%	Rank history: #21 in FY2022, #18 in FY2023, #20 in FY2024 and not on the FY2025 list; up 244 since FY2020.
44	Ocean Duchess, Inc. Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$56,143,842	0.2%	Rank history: #72 in FY2022, #57 in FY2023, #66 in FY2024 and #62 in FY2025; up 14 since FY2020.
45	Midwest Air Traffic Control Service Inc. Top agencies DOT (Department of Transportation) Navy (Department of the Navy)	$55,052,546	0.2%	Rank history: #43 in FY2022, #39 in FY2023, #38 in FY2024 and #37 in FY2025; down 1 since FY2020.
46	Serrato Corporation Top agencies DOL (Department of Labor)	$54,199,407	0.2%	Rank history: #68 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
47	Regents of the University of California the (4458) Top agencies DOE (Department of Energy)	$53,970,000	0.2%	Rank history: #94 in FY2022, #65 in FY2023, #69 in FY2024 and #71 in FY2025; up 3 since FY2020.
48	The GEO Group, Inc. 2 awardees, including GEO Secure Services, LLC Top agencies DOJ (Department of Justice)	$50,491,516	0.2%	Rank history: #40 in FY2022, #52 in FY2023, #29 in FY2024 and #30 in FY2025; up 113 since FY2020.
49	The Day & Zimmermann Group, Inc. Through SOC Nevada LLC Top agencies Army (Department of the Army)	$49,328,779	0.1%	Rank history: #65 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
50	Chugach Alaska Corporation 3 awardees, including Chugach Education Services, Inc. and Chugach Training and Educational Solutions, LLC Top agencies DOL (Department of Labor)	$48,490,007	0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
51	Global Asset Technologies LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$48,241,085	0.1%	Rank history: #48 in FY2022 and not on the FY2023–FY2025 lists; down 12 since FY2020.
52	Koa Lani JV LLC Top agencies Navy (Department of the Navy)	$45,599,730	0.1%	Rank history: #31 in FY2022, #37 in FY2023, #42 in FY2024 and #39 in FY2025; new, not ranked in FY2020.
53	Alternate Perspectives Inc. Top agencies DOL (Department of Labor)	$44,575,247	0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
54	Kbr, Inc. 2 awardees, including KBR Services, LLC and KBR Wyle Services, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$43,251,387	0.1%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; up 29 since FY2020.
55	Serco North America (Holdings) Inc Through Serco Inc. Top agencies DOT (Department of Transportation) USAF (Department of the Air Force)	$43,017,425	0.1%	Rank history: #46 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
56	PAE Government Services Inc. 2 awardees, including Metis Solutions, LLC Top agencies DOS (Department of State) USAF (Department of the Air Force)	$42,561,151	0.1%	Rank history: not on the FY2022–FY2025 lists; up 87 since FY2020.
57	Cook Inlet Region Inc. Through OSC Technical Solutions, LLC Top agencies DOE (Department of Energy)	$41,511,464	0.1%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
58	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top agencies DOS (Department of State)	$40,500,000	0.1%	Rank history: #50 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
59	Arctic Slope Regional Corporation 2 awardees, including Asrc Federal Field Services, LLC and Asrc Federal System Solutions LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$40,309,384	0.1%	Rank history: #49 in FY2022, #51 in FY2023, #89 in FY2024 and #47 in FY2025; down 2 since FY2020.
60	Tsay Professional Services, Inc. Top agencies Army (Department of the Army)	$39,992,245	0.1%	Rank history: #51 in FY2022, #67 in FY2023, #74 in FY2024 and #65 in FY2025; up 18 since FY2020.
61	CAE Inc. 2 awardees, including CAE USA Inc. and CAE USA Mission Solutions Inc. Top agencies USAF (Department of the Air Force)	$37,890,459	0.1%	Rank history: #44 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; up 141 since FY2020.
62	Sodexo Management Inc. Top agencies Navy (Department of the Navy)	$35,816,501	0.1%	Rank history: not on the FY2022–FY2025 lists; down 26 since FY2020.
63	Four Seasons Environmental Inc. Top agencies HHS (Department of Health and Human Services)	$35,724,746	0.1%	Rank history: #57 in FY2022, #75 in FY2023, not on the FY2024 list and #46 in FY2025; up 1 since FY2020.
64	Pacific-Gulf Marine, Inc. Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$33,385,001	0.1%	Rank history: #45 in FY2022, #43 in FY2023, #53 in FY2024 and #53 in FY2025; up 5 since FY2020.
65	American Ordnance LLC Top agencies Army (Department of the Army)	$33,214,384	0.1%	Rank history: #41 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; down 32 since FY2020.
66	The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$33,045,689	0.1%	Rank history: not on the FY2022–FY2025 lists; up 57 since FY2020.
67	Georgia State of Through Georgia Vocational Rehabilitation Agency Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$32,652,327	0.1%	Rank history: #60 in FY2022, #56 in FY2023, #73 in FY2024 and not on the FY2025 list; up 17 since FY2020.
68	Northrop Grumman Corporation Through Orbital Sciences LLC Top agencies NASA (National Aeronautics and Space Administration)	$32,383,032	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
69	RES-Care Inc. Top agencies DOL (Department of Labor)	$31,958,739	0.1%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
70	Cherokee Nation 4 awardees, including Cherokee Nation Management & Consulting, L.l.c.. and Cherokee Federal Solutions, L.L.C. Top agencies Navy (Department of the Navy) DOL (Department of Labor) USAF (Department of the Air Force)	$31,765,926	0.1%	Rank history: #55 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; up 118 since FY2020.
71	South Carolina State of Through South Carolina Commission for Blind Top agencies Army (Department of the Army)	$31,550,707	0.1%	Rank history: #59 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; down 18 since FY2020.
72	L3Harris Technologies, Inc. Through Manu KAI LLC Top agencies Navy (Department of the Navy)	$26,919,466	0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
73	Louis Berger U.S. Inc. 2 awardees, including VGS Infrastructure Services Inc. and VGS Aircraft Services, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Army (Department of the Army)	$25,434,627	0.1%	Rank history: #85 in FY2022, not on the FY2023 list, #98 in FY2024 and not on the FY2025 list; up 93 since FY2020.
74	RTX Corporation Through Raytheon Company Top agencies Navy (Department of the Navy)	$24,693,487	0.1%	Rank history: #74 in FY2022, #70 in FY2023 and not on the FY2024–FY2025 lists; up 38 since FY2020.
75	Leidos, Inc. Top agencies NSF (National Science Foundation)	$24,012,277	0.1%	Rank history: not on the FY2022–FY2025 lists; down 45 since FY2020.
76	Heritage Services Corporation Top agencies DOL (Department of Labor)	$23,749,060	0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
77	Missouri State of 2 awardees, including Missouri Department of Social Services Top agencies Army (Department of the Army)	$23,508,506	0.1%	Rank history: not on the FY2022 list, #71 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
78	Matson Navigation Company Inc Top agencies Navy (Department of the Navy)	$22,275,621	0.1%	Rank history: #53 in FY2022, #41 in FY2023, #88 in FY2024 and not on the FY2025 list; down 16 since FY2020.
79	Endless Horizons Inc. Through Horizons Youth Services, L.C. Top agencies DOL (Department of Labor)	$22,252,270	0.1%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
80	Education & Training Resources LLC Top agencies DOL (Department of Labor)	$21,788,558	0.1%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
81	El Dorado Resort Co.,Ltd. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$21,756,500	0.1%	Rank history: #89 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
82	The Chenega Corporation 3 awardees, including Chenega Facilities Management LLC, Chenega Applied Solutions, LLC and Chenega Healthcare Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$20,980,461	0.1%	Rank history: #86 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
83	Commonwealth Scientific and Industrial Research Organisation Top agencies NASA (National Aeronautics and Space Administration)	$20,975,102	0.1%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
84	Aleut O&M Services, LLC Top agencies Army (Department of the Army)	$20,755,302	0.1%	Rank history: #79 in FY2022, #69 in FY2023, #64 in FY2024 and #78 in FY2025; up 8 since FY2020.
85	R & D Maintenance Services Inc. Top agencies Army (Department of the Army)	$20,219,611	0.1%	Rank history: #77 in FY2022, not on the FY2023 list, #54 in FY2024 and #60 in FY2025; down 9 since FY2020.
86	Tatitlek Training Services, Inc. Top agencies Army (Department of the Army)	$19,583,829	0.1%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
87	Mercury Air Group, Inc. 2 awardees, including Maytag Aircraft LLC and Maytag Aircraft / Tk&K, LLC Top agencies DLA (Defense Logistics Agency)	$19,547,177	0.1%	Rank history: #56 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 66 since FY2020.
88	Human Learning Systems LLC Top agencies DOL (Department of Labor)	$19,489,122	0.1%	Rank history: #64 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
89	TK & K Services LLC Top agencies DLA (Defense Logistics Agency)	$18,813,682	0.1%	Rank history: #61 in FY2022, #61 in FY2023, not on the FY2024 list and #95 in FY2025; up 18 since FY2020.
90	Afognak Native Corporation 9 awardees, including Alutiiq Essential Services LLC, "Alutiiq Logistics & Maintenance Services, Llc" and Alutiiq Management Services, LLC Top agencies DOL (Department of Labor) NASA (National Aeronautics and Space Administration) DOE (Department of Energy)	$17,646,448	0.1%	Rank history: not on the FY2022 list, #84 in FY2023 and not on the FY2024–FY2025 lists; down 25 since FY2020.
91	Minact, Inc. Top agencies DOL (Department of Labor)	$17,611,139	0.1%	Rank history: not on the FY2022–FY2025 lists; down 20 since FY2020.
92	Texas Native Health Top agencies HHS (Department of Health and Human Services)	$16,995,055	0.1%	Rank history: not on the FY2022–FY2025 lists; up 65 since FY2020.
93	Indian Health Care Resource Center of Tulsa, Inc. Top agencies HHS (Department of Health and Human Services)	$16,850,168	0.1%	Rank history: not on the FY2022–FY2025 lists; up 35 since FY2020.
94	Solution One Industries, Inc. Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$15,987,626	<0.1%	Rank history: #96 in FY2022, #89 in FY2023, #93 in FY2024 and #98 in FY2025; up 159 since FY2020.
95	LB & B Associates Inc. Top agencies DLA (Defense Logistics Agency)	$15,843,705	<0.1%	Rank history: #78 in FY2022, not on the FY2023 list, #95 in FY2024 and not on the FY2025 list; up 38 since FY2020.
96	At2, LLC Top agencies USAF (Department of the Air Force)	$15,596,534	<0.1%	Rank history: #87 in FY2022, #80 in FY2023, #90 in FY2024 and #90 in FY2025; up 4 since FY2020.
97	EMCOR Group, Inc. Through Emcor Government Services, Inc. Top agencies DOE (Department of Energy)	$15,516,090	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 55 since FY2020.
98	Exceed, LLC Top agencies DOL (Department of Labor)	$14,753,226	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
99	Science Applications International Corporation 2 awardees Top agencies NASA (National Aeronautics and Space Administration)	$14,740,339	<0.1%	Rank history: not on the FY2022 list, #46 in FY2023, #30 in FY2024 and #40 in FY2025; up 15 since FY2020.
100	Tunista Logistics Solutions, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$13,979,150	<0.1%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.

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100 of 1,037 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC M1

Code	Net obligations	Largest contractor
M1JZ Operation of Miscellaneous Buildings	$13,588,431,327	Honeywell International Inc.
M1CZ Operation of Other Educational Buildings	$788,354,235	Management & Training Corporation
M1AZ Operation of Other Administrative Facilities and Service Buildings	$685,069,435	Deployed Resources LLC
M1FD Operation of Dining Facilities	$481,214,904	Sodexo
M1PZ Operation of Other Non-Building Facilities	$455,562,415	Saltchuk Resources, Inc.
M1GZ Operation of Other Warehouse Buildings	$221,762,935	Remington Arms Company LLC
M1NA Operation of Fuel Supply Facilities	$210,673,684	Crowley Government Services Inc.
M1AA Operation of Office Buildings	$50,870,470	Tunista Logistics Solutions, LLC
M1PA Operation of Recreation Facilities (Non-Building)	$36,405,062	R & D Maintenance Services Inc.
M1ND Operation of Sewage and Waste Facilities	$32,091,593	Veolia Water North America-West LLC
M1LZ Operation of Parking Facilities	$20,206,821	In & Out Valet Co

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $33.6 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC M1 contractors in FY2021?

1. Honeywell International Inc. ($5.98B), 2. Triad National Security, LLC ($3.96B), 3. Battelle Memorial Institute ($2.63B), 4. Consolidated Nuclear Security, LLC ($2.61B), 5. Ut-Battelle LLC ($2.27B), 6. Savannah River Nuclear Solutions LLC ($1.66B), 7. Fluor Corporation ($1.62B), 8. Government of the United States ($1.61B), 9. State of California Controllers Office ($1.16B), 10. Mission Support & Test Services LLC ($855M).

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